Air filter is the abbreviation for air filter element
During the operation of the engine, a large amount of air needs to be sucked in. If the air is not filtered and the suspended dust in the air is sucked into the cylinder, it will accelerate the wear of the piston group and cylinder. Large particles entering between the piston and cylinder can cause serious "cylinder pulling" phenomenon, especially in dry and sandy working environments. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand particles in the air, ensuring that sufficient and clean air enters the cylinder

According to the filtration principle, air filters can be divided into several types: filtration type, centrifugal type, oil bath type, and composite type
1. During installation, whether flange, rubber pipe connection or direct connection is used between the air filter and the engine intake pipe, it must be tight and reliable to prevent air leakage. Rubber washers must be installed on both ends of the filter element; The wing nut securing the air filter cover should not be tightened too tightly to avoid damaging the paper filter element.
2. During maintenance, the paper filter element must not be cleaned in oil, otherwise the paper filter element will fail and may also cause flying accidents. During maintenance, only vibration method, soft brush removal method (brush along its wrinkles), or compressed air back blowing method can be used to remove dust and dirt attached to the surface of the paper filter element. For the coarse filter section, dust collection areas, blades, and cyclone tubes should be promptly cleaned of dust. Even if carefully maintained every time, the paper filter element cannot fully restore its original performance, and its intake resistance will increase. Therefore, when the paper filter element needs the fourth maintenance, it should be replaced with a new filter element. If the paper filter element experiences problems such as breakage, perforation, or detachment of the filter paper from the end cover, it should be replaced immediately.
3. When using, it is necessary to strictly prevent the paper core air filter from getting wet by rainwater, as once the paper core absorbs a large amount of water, it will greatly increase the intake resistance and shorten the mission. In addition, the paper core air filter should not come into contact with oil or fire.
4. Some vehicle engines are equipped with a cyclone air filter, and the plastic cover at the end of the paper filter is a guide cover. The blades on the cover rotate the air, and 80% of the dust is separated by centrifugal force and collected in the dust collection pocket. The dust that reaches the paper filter is 20% of the inhaled dust, with a total filtration efficiency of about 99.7%. So, when maintaining the cyclone air filter, be careful not to miss the plastic guide cover on the filter element.